#include <iostream>
using namespace std;

void xout(){
    int a = 190;
    printf("%d\n",a);
}


/* int num = 100; */

/* void print(){ */
/*     cout << "hello" << endl; */
/* } */

namespace wd
{
int num = 1000;

void print(){
    cout << "world" << endl;
}
}//end of namespace wd

//using编译指令
using namespace wd;
void test0(){
    cout << num << endl;

    print();
}

int main(void){
    test0();
    return 0;
}
